body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
ol,
li,
dl,
dd,
dt,
input,
form,
fieldset,
legend {
  margin: 0;
  padding: 0;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
img {
  /* 去除img下方间距 */
  /* vertical-align: middle; */
  display: block;
  border: 0;
}
input {
  outline: none;
}
a {
  text-decoration: none;
  /* 去除超链接下划线 */
  color: #333;
}
ul,
ol,
li {
  list-style: none;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: normal;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.clr::after {
  content: ".";
  display: block;
  height: 0;
  clear: both;
  overflow: hidden;
  visibility: hidden;
}
.clr {
  zoom: 1;
}
.hide {
  display: none;
}
.show {
  display: block;
}
